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Shirou and Kurono are siblings bound by both a fierce musical rivalry and an extraordinary shared secret. As gifted piano prodigies, they possess the rare ability to perceive music as a physical manifestation—an apparition taking the form of a man—that appears whenever they play. This supernatural connection to their art has long fueled their competitive drive, pushing each sibling to outshine the other on the keys while guarding their unique gift from the outside world. However, everything changes when Shirou enters high school. Without warning, he loses his ability to see the apparition that once guided his performances. Terrified of falling behind and desperate to protect his pride, he conceals this devastating loss from his sister. While Kurono continues to advance with her extraordinary vision intact, Shirou throws himself into grueling practice sessions, relying solely on his own effort to match her growing talent. Stripped of the very phenomenon that defined his musicianship, he faces a quiet but agonizing struggle to keep pace with the one rival who knows him best, all while maintaining the illusion that nothing has changed.